docs: def sia_bipartitions(nodes, node_labels=None):
      """Return all |big_phi| cuts for the given nodes.
  
      This value changes based on :const:`config.CUT_ONE_APPROXIMATION`.
  
      Args:
          nodes (tuple[int]): The node indices to partition.
      Returns:
          list[Cut]: All unidirectional partitions.
      """
      if config.CUT_ONE_APPROXIMATION:
          bipartitions = directed_bipartition_of_one(nodes)
      else:
          # Don't consider trivial partitions where one part is empty
          bipartitions = directed_bipartition(nodes, nontrivial=True)
  
      return [Cut(bipartition[0], bipartition[1], node_labels)
              for bipartition in bipartitions]